Despite some pressure to take on Mr Le Pen and his extremist views, Mr Chirac declared that such "intolerance and hatred" made a debate impossible.
The debate has been a feature of the presidential campaign since the 1970s, and Mr Le Pen has condemned his rival's decision as an "attack on the rules of the democracy"..
Commentators had warned that Mr Le Pen could put the incumbent president on the spot over the string of allegations concerning sleaze and corruption when he was mayor of Paris, as well as raising other awkward issues.
Mr Chirac however insisted that his decision was a principled one.
"Just as I did not accept any alliance in the past with the National Front, whatever the political price, I will not accept a debate with its leader in the future," he told a campaign rally in the western city of Rennes.
"You must have the courage of your convictions and the steadfastness of your commitments."
Jean-Marie Le Pen
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Mr Le Pen himself is preparing for his major television interview since coming second in the first round of the presidential poll on Sunday, seeing off the Socialist Prime Minister Lionel Jospin.
A student confederation has called a mass protest to coincide with Mr Le Pen's television appearance on Tuesday evening, at the end of a day of demonstrations against his shock election success.
During the day more than 70,000 people - most of them school and university students - gathered in Paris, Lyon, Toulouse, La Rochelle and other cities for a second day of protests.
Elsewhere in France,
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On Monday, a total of 100,000 took to the streets in France: placards reading "I am ashamed" were hoisted in cities from Lille in the north to Marseilles on the Mediterranean coast.
Challenge
Mr Chirac has called on voters to rally around him to preserve the unity of the republic and respect for human rights.
But the National Front leader has been relishing his chance to take on the incumbent president, pledging to end what he calls a "decadent and corrupt system".
Outlining his policies, Mr Le Pen has appeared to compare the European Union with the late USSR and predicted that France might disappear under the weight of immigration.
In presidential style, he also commended the defeated Socialist leader for announcing his retirement from politics.
"I think we must praise the noble gesture of Mr Jospin, who
drew the conclusions from his failure," he said.
Mr Jospin's Socialists and the other main parties of the left have called on their supporters to back Mr Chirac on 5 May in a concerted effort to defeat the far-right challenger.
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Related to this story:
French election in quotes
(22 Apr 02 | Europe)
Le Pen vote alarms Africa
(22 Apr 02 | Africa)
Blair: France will reject extremism
(22 Apr 02 | UK Politics)
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